formatting.php - Recoverable fatal error: Object of class WP_Error

wordpress getting error how to solve ?

Recoverable fatal error: Object of class WP_Error could not be converted to string in /srv/users/serverpilot/apps/amavideniz/public/wp-includes/formatting.php on line 1115

/**
* Checks for invalid UTF8 in a string.
*
* @since 2.8.0
*
* @staticvar bool $is_utf8
* @staticvar bool $utf8_pcre
*
* @param string $string The text which is to be checked.
* @param bool $strip Optional. Whether to attempt to strip out invalid UTF8. Default is false.
* @return string The checked text.
*/
function wp_check_invalid_utf8( $string, $strip = false ) {
$string = (string) $string;

if ( 0 === strlen( $string ) ) {
return '';
}

// Store the site charset as a static to avoid multiple calls to get_option()
static $is_utf8 = null;
if ( ! isset( $is_utf8 ) ) {
$is_utf8 = in_array( get_option( 'blog_charset' ), array( 'utf8', 'utf-8', 'UTF8', 'UTF-8' ) );
}
if ( ! $is_utf8 ) {
return $string;
}

// Check for support for utf8 in the installed PCRE library once and store the result in a static
static $utf8_pcre = null;
if ( ! isset( $utf8_pcre ) ) {
// phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged
$utf8_pcre = @preg_match( '/^./u', 'a' );
}
// We can't demand utf8 in the PCRE installation, so just return the string in those cases
if ( ! $utf8_pcre ) {
return $string;
}

// phpcs:ignore WordPress.PHP.NoSilencedErrors.Discouraged -- preg_match fails when it encounters invalid UTF8 in $string
if ( 1 === @preg_match( '/^./us', $string ) ) {
return $string;
}

// Attempt to strip the bad chars if requested (not recommended)
if ( $strip && function_exists( 'iconv' ) ) {
return iconv( 'utf-8', 'utf-8', $string );
}

return '';
}